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Transocean Ltd. Provides Fleet Update Summary

ZUG, SWITZERLAND--(Marketwire - Sep 15, 2011) - Transocean Ltd. (NYSE: RIG) (SIX: RIGN) today issued a monthly fleet update summary covering only newly signed contracts, significant changes to existing contracts and changes to estimated out of service time of 30 days or more for High-Specification Floaters or 60 days or more for all other rig classes since our last monthly fleet update summary dated August 17, 2011. The report, entitled "Transocean Fleet Status Report," is available at www.deepwater.com and can be accessed by clicking on the Fleet Status Report link found in the tool bar.

Forward-Looking Statements

Statements regarding the estimated duration of client contracts, contract dayrate amounts, future contract commencement dates and locations, planned shipyard projects and other out of service time, as well as any other statements that are not historical facts in the report, are forward-looking statements that involve certain risks, uncertainties and assumptions. These include but are not limited to operating hazards and delays, risks associated with international operations, actions by customers and other third parties, the future prices of oil and gas and other factors detailed in the company's most recent Form 10-K and other filings with the Securities and Exchange Commission. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those indicated.

About Transocean

Transocean is the world's largest offshore drilling contractor and the leading provider of drilling management services worldwide. With a fleet of 134 mobile offshore drilling units as well as four High-Specification Jackups under construction, Transocean's fleet is considered one of the most modern and versatile in the world due to its emphasis on technically demanding segments of the offshore drilling business. Transocean owns or operates a contract drilling fleet of 48 High-Specification Floaters (Ultra-Deepwater, Deepwater and Harsh-Environment semisubmersibles and drillships), 25 Midwater Floaters, nine High-Specification Jackups, 51 Standard Jackups and one swamp barge.

For more information about Transocean, please visit our website at www.deepwater.com.